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What is the shaft in the lifter valley called and what is it for? A buddy stopped buy with his block so I could help him get a bolt out and I've never see the insides of a 4.3 before. It looks like some type of balancing shaft. Can someone please educate me.
 

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About mid nineties a "balance shaft" was added to the 4.3. V-6 engines tend to be unbalanced "shakers". These wern't bad, but GM wanted a smoother engine. They imitated what a few foreign builders were doing and added the balance shaft. It's function is to shake the engine internally in the opposite direction of the engines natural harmonics. Thus canceling the vibrations out at certain rpms. Usually at cruising speed.
 

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macomb, i used to live there years ago.

92 was first year for the balance shaft

my 91 doesnt have one

my brother had a 92

ive worked on tons of these 4.3 engines

love em

always run strong and forever


have over 300k on one in one of the work astro vans


197k on mine

a little more was on the 92 still running great




good luck
 
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